According to Memory Alpha it's fermented blood and sugar, though it has been seen in bottles with grapes on the front. Maybe like real wine you get different varieties? Can't say I'd fancy it though, don't mind a bit of black pudding but not sure I could down it in the pints!
Liking the seasons greetings LCARS.
The Jem'hadar wish you a victorious new year, in the hopes that victory brings life.
Happy belated New Year Everyone.